Re: [Users] SOLVED: Recovering VMs when the engine is lost

On 11/28/2012 07:36 AM, Joern Ott wrote: > Hello Itamar and Ayal, > > I tried to recover the VMs by using the first method (converting the > master into an export domain) but after the changes, I couldn't add > the export domain as it was "an incompatible version". Therefore I > explored the other way of restoring: > - First, I copied the master/vms folder from the master storage to my > local host (and renamed al the .ovf to .xml so I can double click > them and view them in an xml browser on my stupid Windows) > - As we store the ovirt NFS export folder on /data/ovirt, I connected > to all nodes and moved the $UUID folder from /data/ovirt to /data/old. > - I added all the cpu nodes and NFS storages to the new cluster > - I recreated the virtual machines based on the xml files in the > specs and our internal vm specifications with exactly the same MAC > address (we specify our own) and disk sizes, having the disks > residing on the same storages as the old disks > - Looking at the xml file of the new VMs I figured out the folders > and file names of the new disks and then moved the old disks over: > cd /data/ovirt/$UUID/images/$FOLDERUUID > mv /data/old/images/$OLDFOLDERUUID/$OLDDISKUUID ./$DISKUUID > mv /data/old/images/$OLDFOLDERUUID/$OLDDISKUUID.meta ./$DISKUUID.meta > mv /data/old/images/$OLDFOLDERUUID/$OLDDISKUUID.lease ./$DISKUUID.lease > - After doing this, the new VM starts nicely using the disks with all > the content on them > > Of course, you can also choose other storages for the new disks, but > then you have to rsync -avS the sparse files over to the new storage > and this takes hours for 600G disks. > > Caveats: There were a few machines I actually created from a > template. In the XML files for those machines, we had the wrong MAC > addresses for the nics. I assume, that these were the ones generated > during the template clone and not the final ones I set after cloning > the VMs. But as we have nice host specifications as yaml files for > every host, I was relying more on them than on the XML. > > In the end, it took me around 3 minutes of manual work to recreate > the vm, move the disks over and start the vm. Automating that with a > bit of yaml and xml parsing magic and recreating the VMS > automatically via script could lead to recreating a vm in under 1 > minute (except when moving disks from storage to storage). > > Kind regards > Jörn > >> -----Original Message----- >> From: Itamar Heim [mailto:iheim@redhat.com] >> Sent: Freitag, 23. November 2012 15:34 >> To: Joern Ott >> Cc: users(a)ovirt.org; Ayal Baron >> Subject: Re: [Users] Recovering VMs when the engine is lost >> >> On 11/23/2012 04:16 PM, Joern Ott wrote: >>> Hello Itamar, >>> >>>> -----Original Message----- >>>> From: Itamar Heim [mailto:iheim@redhat.com] >>>> Sent: Freitag, 23. November 2012 14:11 >>>> To: Joern Ott >>>> Cc: users(a)ovirt.org; Ayal Baron >>>> Subject: Re: [Users] Recovering VMs when the engine is lost >>>> >>>> On 11/23/2012 02:58 PM, Joern Ott wrote: >>>>> Hey Itamar, >>>>> >>>>> this is an NFS storage. >>>> >>>> we don't currently support importing an existing data storage domain. >>>> so you need to create a new nfs data domain. >>>> >>>> i suggest two 'hacky' options after that 1. less hacky - convert the >>>> current nfs data domain to an export domain, and import the VMs >>>> from it. >>> >>> Is there any info on how to do this, I didn't find much info on export >> domains on the wiki. The last time I tried to move thin disks with >> ovirt GUI >> from one storage to another, they were expanded and filled up the >> destination. In the database, the disks were shown to be on the >> destination >> host and were marked as "invalid", so this procedure also has some >> risks. >> >> check this one, and please wikify for others if you find it helpful: >> http://comments.gmane.org/gmane.comp.emulators.ovirt.user/4428 >> >>> >>>> 2. more hacky - recreate the VMs on the new nfs data domain with >>>> exact same details, and copy the disk over the newly created disks. >>>> >>>> benefit of the other is you may be able to move the data, instead of >>>> full blown copy, while in option 1 (which is much simpler/less error >>>> prone), you need to import all vm's again. >>> >>> The advantage of this would be faster speed as most disks are thin >> provisioned disks. So I think, I will go for this option. >> >> just to make it clear - this is risky, and you should know what you >> are doing >> when copying/moving files over the new layout, which must be >> identical to >> previous definitions. >> >>>> >>>> there is current work to detect disks from a storage domain: >>>> http://wiki.ovirt.org/wiki/Features/Domain_Scan >>>> >>>> when it will be ready (and better when import existing storage domain >>>> will be supported), this would be easier. >>>> >>>>> >>>>> KR >>>>> Jörn >>>>> >>>>>> -----Original Message----- >>>>>> From: Itamar Heim [mailto:iheim@redhat.com] >>>>>> Sent: Freitag, 23. November 2012 10:32 >>>>>> To: Joern Ott >>>>>> Cc: users(a)ovirt.org; Ayal Baron >>>>>> Subject: Re: [Users] Recovering VMs when the engine is lost >>>>>> >>>>>> On 11/23/2012 11:03 AM, Joern Ott wrote: >>>>>>> Hello everybody, >>>>>>> >>>>>>> I managed to re-install the server the oVirt engine was running on >>>>>>> in my testlab. All the cpu and storages are still there and the >>>>>>> VMs are still running without problems. Is there a way, I can >>>>>>> attach the still existing nodes to the new oVirt engine and >>>>>>> recover/import the >>>> VMs? >>>>>>> >>>>>>> Alternatively, is there a way, I can import the VMs disks? I still >>>>>>> know how the data center and clusters were set up and the specs >>>>>>> for the VMs are also documented, so I'd like to re-attach the >>>>>>> disks, which would save me some time compared to the re-installs. >>>>>>> >>>>>> >>>>>> is this an iscsi or nfs data storage domain? >>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>> Kind regards >>> Jörn >>> >> >> > > while hacky, i wonder if worth wiki-fying.

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